Wind turbine blade and wind power generator using the same

Abstract

An object is to provide a wind turbine blade having a serrated plate that can be formed irrespective of the overall structure of the blade, that is attached in the optimum shape, and that can effectively suppress noise occurring at a trailing edge thereof, and also to provide a wind power generator using such a wind turbine blade. Provided is a wind turbine blade ( 9 ) formed by bonding a back skin ( 19 ) and a front skin ( 21 ) and having a serrated plate ( 35 ) attached to a trailing edge ( 33 ) thereof, and the serrated plate ( 35 ) is formed so as to be attached by bonding the back skin ( 19 ) and the front skin ( 21 ).

The invention claimed is: 
     
       1. A wind turbine blade comprising:
 a back skin and a front skin bonded together; 
 a serrated plate attached to a trailing edge thereof, the serrated plate having a serrated portion on a rear side thereof; 
 a fitting groove extending in a blade length direction formed on an inner side of a boundary between the back skin and the serrated plate on a front skin side; and 
 a fitting portion formed at an end of the front skin at the trailing edge for fitting into the fitting groove, 
 wherein the serrated plate is formed integrally with one of the back skin and the front skin, and an end of another of the back skin and the front skin is fitted to said one of the back skin and the front skin, 
 wherein the serrated plate has a plate-shape and is disposed along a wind flow at the trailing edge of the front skin to the toward a back skin side, 
 wherein the back skin and the front skin are fixed together at the fitting portion into the fitting groove and thereby, the serrated plate is formed integrally with the back skin, 
 wherein each of the back skin and the front skin is one plate member, 
 wherein the serrated plate is a part of the back skin, and 
 wherein the fitting groove has a semicircular concave portion concaved from an inner surface of the boundary between the back skin and the serrated plate, and the fitting portion has a semicircular convex portion convexed from the end of the front skin at the trailing edge to fit into the concave portion. 
 
     
     
       2. The wind turbine blade according to  claim 1 , wherein the serrated plate has a shape extending along a streamline at the trailing edge. 
     
     
       3. A wind power generator that generates electricity using the wind turbine blade according to  claim 1 . 
     
     
       4. The wind turbine blade according to  claim 1 , wherein the serrated plate is disposed from a blade tip to a blade root, and a length of the serrated plate in a blade length direction is 20-30% of a blade length from the blade tip to the blade root. 
     
     
       5. The wind turbine blade according to  claim 1 , wherein the serrated plate is curved upwardly to a side of the front skin for a smooth flow of the wind flow. 
     
     
       6. The wind turbine blade according to  claim 1 , wherein the serrated plate includes an inclined portion outside the insertion portion, the serrated plate being inclined at the inclined portion toward the back skin side and extending along the wind flow of the front skin. 
     
     
       7. The wind turbine blade according to  claim 6 , wherein the insertion portion of the serrated plate has two protruding portions, each protruding toward the back skin and the front skin, arranged in a direction parallel to each other. 
     
     
       8. The wind turbine blade according to  claim 1 , wherein the back skin and the front skin are connected at the trailing edges along the blade length direction other than a portion of the back skin formed with the serrated plate where the fitting portion fits into the fitting groove.